What are wavefronts?
2 marks · EasyA wave travels through water. The frequency of the wave is 2 Hz. Each wave travels a distance of 1.5 m in 1 second.
State the number of complete waves passing a point each second.
What is the wavelength of the wave?
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(a) 2 waves
(b) 0.75 m
Common mistakes: Confusing speed with frequency or wavelength
Show mark scheme and worked solution
Marking points
A1 (a) · 1 mark · States correct frequency as 2 waves per second.
M1 (b) · 1 mark · Calculates wavelength using speed/frequency: wavelength = 1.5 m / 2 waves = 0.75 m.
Worked solution
a) The frequency is 2 Hz, so 2 waves pass a point each second.
b) Wavelength = total distance / number of waves = 1.5 m / 2 = 0.75 m.